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J.M.FRANKEL公司生产一系列探鱼仪,其中包括有可以探测三个不同方向的三种频率的探鱼仪。在这些探鱼仪中,最常用的有NJA 130型和NJA 150型两种,工作频率为50kcs,测深范围可按选择的需要,分别为570米和450米,有四挡量程。这些探鱼仪具有重量轻,体积小、灵敏度高,并装有指示器等优点。特别适宜于象鲔鱼一类的鱼体大的鱼。现介绍一下NJA171型探鱼仪的几种主要特点。
The J.M.FRANKEL company produces a series of fish finder instruments, including a fish finder that can detect three frequencies in three different directions. Among these fishfinders, the most common ones are the NJA 130 and NJA 150. The operating frequency is 50 kcs. The depth range can be 570 meters and 450 meters according to the selection requirements. There are four ranges. These fishfinders have the advantages of light weight, small size, high sensitivity, and indicators. It is particularly suitable for large fish such as salmon. Here are some of the main features of the NJA171 fish finder.